What elements of greatness is it missing? The acting is terrific. It’s an intriguing character study with a quip filled script and it’s told in a way that could only be done in a film (as opposed to a book or a play).
1. An interesting plot
2. "Something" that says "Watch me again!" I've watched "The Godfather" - my choice for the best movie of all time - at least 20 times. Same with "Silence of the Lambs" and "The Rocky Horror Picture Show" All for different reasons, but the same "Watch me again!" call.
CK ia a totally forgetable waste of time. The socialist/progressive agenda made it repulsive.
Mere innovation in technique is worthless if it does not make a movie enjoyable. Doing something for the first time does not make it great, important or noteworthy.